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    <title>Document</title>
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    <script>
        //接受所有实参
        // function sum(...args){
        //     console.log(args)

        // }
        // sum(1,2,3)
        //接受部分实参
        function sum(a, ...args){
            console.log(a)
        }
        sum(1,2,4)
        //合并数组
        let a = [1,2,3]
        let b = [2,3,5]
        console.log([...a,...b])

    </script>
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